Completely replaced all old servers (running Server 2003 and Exchange 2003) and replaced them with Server 2012R2 and Exchange 2013.
Completely rebuilt existing network infrastructure and moved from a /24 to a /16 network.

I just added the "Top 25 Exchange Mailboxes" widget. I noticed that all of the mailbox sizes are showing up with a size ending in "K". I assume this should be saying "GB", since I can safely say that our largest mailbox doesn't have 6.13K of mail.